is_supported_char.hpp

//
// Copyright (c) 2022-2023 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
 
#ifndef BOOST_LOCALE_DETAIL_IS_SUPPORTED_CHAR_HPP_INCLUDED
#define BOOST_LOCALE_DETAIL_IS_SUPPORTED_CHAR_HPP_INCLUDED
 
#include <boost/locale/config.hpp>
#include <type_traits>
 
namespace boost { namespace locale { namespace detail {
    template<typename Char>
    struct is_supported_char : std::false_type {};
 
    template<>
    struct is_supported_char<char> : std::true_type {};
    template<>
    struct is_supported_char<wchar_t> : std::true_type {};
#ifdef __cpp_char8_t
    template<>
    struct is_supported_char<char8_t> : std::true_type {};
#endif
 
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
    template<>
    struct is_supported_char<char16_t> : std::true_type {};
#endif
 
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
    template<>
    struct is_supported_char<char32_t> : std::true_type {};
#endif
 
    template<typename Char>
    using enable_if_is_supported_char = typename std::enable_if<is_supported_char<Char>::value>::type;
 
}}} // namespace boost::locale::detail
 
#define BOOST_LOCALE_ASSERT_IS_SUPPORTED(Char) \
    static_assert(boost::locale::detail::is_supported_char<Char>::value, "Unsupported Char type")
 
 
#endif